CN219549007U - Filtering connecting piece, filtering component and filter - Google Patents

Abstract

The utility model relates to the field of liquid filtration, in particular to an engine oil and fuel oil filtration of an internal combustion engine, and in particular relates to a filtration connecting piece, a filtration assembly and a filter. The filter component comprises a filter element and a filter connecting piece, wherein the filter connecting piece and the filter element are arranged in a separable way. The guide part and the oil return plug are arranged on the filter connecting piece, the position between the oil return plug and the guide part is controllable, the filter element can be directly installed, and the filter element is not influenced by the driving of the guide part and the installation clamping stagnation, so that the lubrication failure or the oil supply failure of a machine part system caused by the distortion and the damage of the installation of the filter element or the installation failure is avoided; the filter connecting piece is arranged separately from the filter element, so that the processing difficulty and the quality control cost are reduced; meanwhile, the filtering connecting piece can be reused, so that maintenance cost is reduced.

Description

Filtering connecting piece, filtering component and filter

Technical Field

The utility model relates to the technical field of liquid filtration, in particular to filtration of oil liquid of an internal combustion engine, and specifically relates to a filtration connecting piece, a filtration assembly and a filter.

Background

In order to avoid environmental pollution caused by oil overflow in the maintenance and replacement process of the filter element of the filter, an oil return channel is arranged in the filter shell, an oil return plug and a guide piece (positioning piece) are arranged on the filter element, when the filter element is correctly installed, the guide piece (positioning piece) enables the oil return plug of the filter element to seal the oil return channel so as to ensure normal system oil pressure, and the oil return channel is required to be opened to discharge the oil in the filter shell in the process of disassembling the filter element.

Typically, during installation of the filter, an operator must accurately adjust the rotational position between the guide and the oil return plug when installing the annular filter element into the filter housing, wherein experience may be prone to error.

The prior art patent CN102781542B discloses a liquid filter, wherein the latter proposes an annular filter insert for a liquid filter, wherein the annular filter insert is formed from a hollow cylindrical filter material body surrounded on the end side by an end disk and can be arranged interchangeably in a filter housing, wherein an eccentric blocking element for an eccentric opening in the bottom of the filter housing is arranged at the lower end disk facing the bottom of the filter housing in the installed state, wherein a positioning element is provided at the annular filter insert, which cooperates with the positioning element provided at the filter housing and guides the blocking element into engagement with the eccentric opening when the annular filter insert is inserted into the filter housing, wherein a first positioning element is a beveled plane, and wherein a second positioning element is a radially projecting nose, which is arranged opposite the beveled plane, and wherein the beveled plane and the eccentric nose can be moved relative to one another in a sliding manner and thus can guide the eccentric nose into engagement with the blocking element when the annular filter insert is rotated relative to the filter housing. In the patent, a positioning piece (nose) and an oil return plug (locking element) are arranged on a filter element, and when the filter element is installed, the filter element is guided by the positioning piece (nose) to passively rotate relative to a filter shell, and in the process, if rotation clamping stagnation exists, the positions of the positioning piece (nose) and the oil return plug (locking element) are deviated or the filter element is distorted and deformed to be damaged, so that lubrication failure or oil supply failure of a machine part system is caused by installation failure;

in general, the positioning piece (nose) and the oil return plug (locking element) need to have a relatively fixed position relationship, in the technical scheme disclosed in the patent, the positioning piece (nose) and the oil return plug (locking element) are preferably arranged on the lower end disc of the filter element at the same time, and in the case that the positioning piece (nose) and the oil return plug (locking element) are arranged on different component parts of the filter element, such as the nose is arranged on the inner edge of the filter element (such as the inner wall of a central supporting tube of the filter element), the locking element is arranged on the lower end disc of the filter element, in practical application, because the filter element and the matched filter shell are different in structure, in most cases, the nose is only arranged on the inner wall of the central supporting tube of the filter element, the locking element is arranged on the lower end disc of the filter element, when the nose and the locking element are arranged on different parts, the assembly of the filter element is required to be completed according to the mutual positions between the parts, and the positions of the filter element are ensured not to deviate when the filter element is subsequently arranged on the assembly shell, so that the processing process becomes relatively complex and difficult to control, and the processing position deviation easily occurs, and the product is scrapped.

Disclosure of Invention

In order to overcome the technical problems in the prior art, the utility model provides a filtering connecting piece, a filtering component and a filter, wherein an oil return plug and a guide part are simultaneously arranged on the filtering connecting piece, the positions between the oil return plug and the guide part are fixed and controllable, the positions between the oil return plug and the guide part cannot generate position deviation in the installation and use process, a filter element can be directly inserted and installed, and machine part system lubrication faults or oil supply faults caused by the distortion and damage of the filter element installation or the installation failure can be avoided; the filter connecting piece is arranged separately from the filter element, so that the processing difficulty and the quality control cost are reduced;

in order to achieve the purpose, the utility model is realized by the following technical scheme:

a filtering connecting piece is used for connecting a filter element and a shell and comprises a tubular framework part and an end disc connected with the framework part, wherein an oil return plug is eccentrically arranged on the outer side of the end disc, an opening part is arranged at the center of the end disc, and a guide part is arranged on the inner side of the framework part or the inner side of the opening part.

Preferably, the guide portion is disposed inside the skeleton portion or inside the opening portion, and protrudes radially inward.

Preferably, the guide portion has an elongated rib shape or an elliptical shape or a diamond shape.

Preferably, the skeleton portion is axially provided with a plurality of axial rib plates, the skeleton portion is radially provided with a plurality of radial rib plates, and a plurality of axial rib plates and a plurality of radial rib plates are staggered to form the oil through holes.

Preferably, the periphery of the skeleton portion is provided with a guide rib.

Preferably, the guide rib is a spiral rib plate or a plurality of rib plates which are arranged in a staggered manner.

Preferably, the skeleton portion is provided with a circular sheet extending radially outwardly adjacent the inner side of the end disk.

Preferably, the thickness of the round sheet is 0.5mm to 2.5mm.

Preferably, the inner wall of the skeleton portion extends radially inwards to form a clamping portion for connecting the screw cap.

Preferably, the oil return plug and the guide part are integrally formed with the end disc.

The utility model provides a filter component, includes the filter core with filter connecting piece, filter connecting piece with the filter core separable sets up, the filter core includes annular filter medium, first end cover and second end cover, the hollow cavity that are connected with filter medium both ends respectively, be equipped with the central opening who link up with the hollow cavity on the second end cover, the central opening of hollow cavity and second end cover can hold filter connecting piece's skeleton portion for inject filter core radial position.

Preferably, the first end cap and/or the second end cap are made of an elastomeric material.

Preferably, the end face of the first end cover and/or the second end cover is/are provided with annular protrusions outwards.

Preferably, the second end cap is provided with an outwardly directed annular projection having an inner diameter no greater than the outer diameter of the circular lamina.

Preferably, the first end cap is provided with a first connecting portion for detachably connecting the skeleton portion.

Preferably, the first end cap is provided with a second connecting portion for connecting the screw cap.

A filter comprises the filter assembly, a shell and a spiral cover.

Compared with the prior art, the utility model has the following beneficial effects:

the oil return plug and the guide part are arranged on the filtering connecting piece at the same time, the positions between the oil return plug and the guide part are fixed and controllable, and the position between the oil return plug and the guide part cannot generate position deviation in the installation and use process, so that the device has the characteristic of reliable installation; the filter element can be directly installed, is not influenced by driving of the guide part and installation clamping stagnation, and avoids lubrication failure or oil supply failure of a machine part system caused by distortion and damage of the filter element installation or installation failure.

Through filter connecting piece and filter core separation setting, can realize processing filter core and filter connecting piece respectively, filter connecting piece can realize integrated into one piece to simplified the production technology of filter core, reduced the processing degree of difficulty and quality control cost.

Through filter connecting piece and filter core separation setting, filter connecting piece repeatedly usable, the user still can only be to the filter core selective replacement, has reduced maintenance cost.

Drawings

FIG. 1 is a schematic view of the overall structure of a filter assembly according to an embodiment of the present utility model;

FIG. 2 is a schematic structural view of a skeleton portion according to an embodiment of the present utility model;

FIG. 3 is a schematic structural view of a skeleton portion according to another embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of a skeleton portion according to another embodiment of the present utility model;

FIG. 5 is a schematic view of a filter element according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of the filter assembly of one embodiment of the present utility model in an assembled, mated condition;

FIG. 7 is a schematic cross-sectional view of a framework and a filter element in a mated state during installation according to an embodiment of the present utility model;

FIG. 8 is a schematic cross-sectional view of a framework portion and a filter cartridge of another embodiment of the present utility model in a mated configuration during installation;

FIG. 9 is a schematic cross-sectional view of a framework portion and a filter cartridge of another embodiment of the present utility model in a mated configuration during installation;

FIG. 10 is a schematic view of a first end cap according to an embodiment of the present utility model;

FIG. 11 is a schematic view of a first end cap according to another embodiment of the present utility model;

FIG. 12 is a schematic view of a first end cap according to another embodiment of the present utility model;

FIG. 13 is a schematic view of a first end cap according to another embodiment of the present utility model;

FIG. 14 is a schematic cross-sectional view showing the overall structure of a filter according to an embodiment of the present utility model;

FIG. 15 is a schematic view of a housing of a filter according to an embodiment of the utility model;

fig. 16 is a schematic cross-sectional view of a skeleton portion according to another embodiment of the present utility model.

In the figure: 1. a filter connection; 11. a skeleton portion; 111. a circular sheet; 112. axial rib plates; 113. radial rib plates; 114. oil holes; 115. a clamping part; 116. a sealing lip; 117. an elastomer; 12. an end plate; 13. an oil return plug; 14. a guide part; 16. an opening portion; 17. a flow guiding rib; 2. a filter element; 21. a filter medium; 22. a first end cap; 221. a second connecting portion; 222. a first connection portion; 223. an opening; 23. a second end cap; 231. a central opening; 24. an annular protrusion; 25. a hollow cavity; 3. screwing the cover; 31. the screw cap is buckled; 4. a housing; 41. an oil return hole; 42. installing a guide slideway; 43. a guide positioning groove; 44. an oil inlet hole; 45. and an oil outlet.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in the present utility model will be understood by those skilled in the art according to specific circumstances.

Referring to fig. 2, in a first embodiment of a filter connecting member according to the present utility model, in this embodiment, the filter connecting member 1 is used for connecting a filter element 2 and a housing 4, and includes a tubular skeleton portion 11, an end disc 12 connected to the skeleton portion 11, and an oil return plug 13 eccentrically disposed on the outer side of the end disc 12, where the oil return plug 13 is used for sealing an oil return channel of the housing 4 to ensure normal system oil pressure; referring to fig. 1, an opening 16 is provided at the center of the end disc 12, a guiding portion 14 is provided at the inner side of the skeleton portion 11, and the guiding portion 14 may be a guiding rib for circumferential positioning of the filter connecting piece 1 installed in the filter housing, so as to improve the installation reliability; through setting up oil return plug 13, guide part 14 simultaneously on filtering connecting piece 1, the fixed controllable in position between oil return plug 13 and the guide part 14, the position can not produce the position skew between oil return plug 13 and the guide part 14 in the installation use, has the reliable characteristics of installation.

In this embodiment, the guiding portion 14 is disposed inside the skeleton portion 11 and protrudes radially inward, so as to circumferentially position the filter connector 1 for installation in the filter housing, thereby improving the reliability of installation.

In this embodiment, the guide 14 is in the form of an elongated rib for circumferential positioning of the filter connection 1 mounted in the housing 4. For adapting to the installation of the guide slide way 41 in the shell 4, the guide part 14 can be in an elliptic shape or in a diamond shape, so that the installation reliability is improved.

In this embodiment, the skeleton portion 11 is axially provided with a plurality of axial ribs 112, the skeleton portion 11 is radially provided with a plurality of radial ribs 113, and the axial ribs 112 and the radial ribs 113 are staggered to form oil holes 114. The radial rib 113 may be used for detachably clamping with the cap screwing buckle 31 of the cap screwing 3, and the oil through hole 114 is used for oil circulation.

In this embodiment, the outer periphery of the skeleton portion 11 is provided with a deflector rib 17. The guide ribs 17 are used for oil circulation, so that resistance to the flow of fuel oil or engine oil is reduced.

Referring to fig. 2, in this embodiment, the guide rib 17 is a spiral rib. The spiral rib plate is relatively thicker in the radial direction, can bear larger radial pressure of fuel oil or engine oil, improves the strength of the skeleton part 11, and simultaneously maintains a wider diversion channel.

Referring to fig. 4, in this embodiment, the skeleton portion 11 is provided with a circular sheet 111 extending radially outwardly near the inner side of the end plate 12. The circular sheet 111 serves to adjust the clearance in the axial direction of the filter assembly, completing the axial seal.

In this embodiment, the thickness of the circular sheet 111 is 0.5mm to 2.5mm. The thickness of the circular sheet 111 is proved to be optimal in 0.5 mm-2.5 mm elasticity through practice, and the circular sheet 111 is used for compensating manufacturing errors of axial length dimensions of the filter element 2, the shell 4 and the spiral cover 3, eliminating installation axial gaps and realizing sealing connection of the filter element in the axial direction.

In this embodiment, the inner wall of the skeleton portion 11 extends radially inward to form a clamping portion 115 for connecting the screw cap 3. The clamping portion 115 may be a plurality of hooks or snap rings, and is used for being connected with the screw cap 3 in a matching manner.

Referring to fig. 1, 2, 5, 6 and 10, in this embodiment, the filter assembly of the present utility model includes a filter element 2 for filtering oil and a filter connecting member 1, where the filter connecting member 1 is detachably disposed with the filter element 2, and the filter connecting member 1 is disposed separately from the filter element 2, so that the filter element 2 and the filter connecting member 1 can be processed respectively, the filter connecting member 1 can be formed integrally, and the production process of the filter element is simplified, and the processing difficulty and the quality control cost are reduced; the filter connecting piece 1 is arranged in a way of separating from the filter element 2, the filter connecting piece 1 can be reused, and a user can only selectively replace the filter element 2, so that the maintenance cost is reduced; the filter element 2 comprises an annular filter medium 21, a first end cover 22, a second end cover 23 and a hollow cavity 25, wherein the first end cover 22 and the second end cover 23 are respectively connected with two ends of the filter medium 21, a central opening 231 communicated with the hollow cavity 25 is formed in the second end cover 23, and the central openings 231 of the hollow cavity 25 and the second end cover 23 can accommodate the framework part 11 of the filter connecting piece 1 and are used for limiting the radial position of the filter element 2. The filter element 2 can be directly installed, is not influenced by driving of the guide part and installation clamping stagnation, and avoids lubrication failure or oil supply failure of a machine part system caused by distortion and damage of installation of the filter element 2 or installation failure.

In this embodiment, the first end cap 22 and the second end cap 23 are made of an elastomeric material. The elastomer material is used for eliminating the installation axial gap and improving the sealing performance of the filter assembly. In other embodiments, only the first end cap 22 may be made of an elastomeric material, or only the second end cap 23 may be made of an elastomeric material, for cost saving.

In this embodiment, the end surfaces of the first end cover 22 and the second end cover 23 are provided with annular protrusions 24 outwards. The annular bulge 24 on the first end cover 22 is used for mounting and sealing connection of the filter element 2 and the spiral cover 3, and the annular bulge 24 on the second end cover 23 is used for improving the sealing effect between the filter element 2 and the filter connecting piece 1. For cost saving, only the annular projection 24 facing outward may be provided on the end face of the first end cap 22, or only the annular projection 24 facing outward may be provided on the end face of the second end cap 23.

In this embodiment, the first end cap 22 is provided with a first connection portion 222 for detachably connecting the frame portion 11. The first connecting portion 222 may be a hook or an external clip, and is configured to be clamped with the skeleton portion 11.

In this embodiment, the first end cap 22 is provided with a second connection portion 221 for connecting the screw cap 3. The second connecting portion 221 is provided at a central position of the first end cap 22. The second connecting portion 221 may be a hook or an external clip, for being engaged with the screw cap 3.

Referring to fig. 14-15, the present utility model also provides a filter, which in this embodiment includes the filter assembly, the housing 4 and the screw cap 3. The filtering assembly is used for being installed inside the casing 4, an oil return hole 41 and an installation guide slideway 42 are arranged on the casing 4, and a guide positioning groove 43 matched with the guide part 14 is arranged on the installation guide slideway 42.

The filter is installed in various modes, such as a first installation mode is that firstly, the filter connecting piece 1 is guided and installed into the shell 4 through the matching of the guide part 14 and the installation guide slideway 42, the oil return plug 13 seals the oil return hole 41, the filter element 2 is installed, and finally, the spiral cover 3 is installed on the shell 4;

the second installation mode is that the filter connecting piece 1 is assembled with the filter element 2, then the filter connecting piece is assembled into the shell 4 together with the matched guide of the installation guide slideway 42 through the guide part 14, the oil return plug 13 seals the oil return hole 41, and finally the spiral cover 3 is installed on the shell 4;

the third installation mode is that the filter connecting piece 1 is guided and installed into the shell 4 through the matching of the guide part 14 and the installation guide slideway 42, the oil return plug 13 seals the oil return hole 41, the filter element 2 is installed into the spiral cover 3, and finally the combined spiral cover 3 and the filter element 2 are installed into the shell 4 together;

the fourth installation mode is that the filter connecting piece 1 in the filter component is inserted into the filter element 2, the filter component is connected with the spiral cover 3 through the second connecting part 221, the assembled filter connecting piece 1, the filter element 2 and the spiral cover 3 are assembled into the shell 4 through the matching guide of the guide part 14 and the installation guide slideway 42, and the oil return plug 13 seals the oil return hole 41.

After the filter is normally installed, fuel enters from the oil inlet hole 44 of the shell 4, is filtered by the filter medium 21 to be filtered by the impurities of the particles, passes through the oil through hole 114 and passes through the cleaning channel in the filter connecting piece 1 to reach the oil outlet 45 of the shell 4, and is discharged from the oil outlet 45 of the shell 4, so that the filtering process of the impurities of the particles of the fuel is completed.

When the filter is disassembled, the spiral cover 3 is opened, and as any radial rib 113 or the second connecting part 221 of the filter connecting piece 1 is connected with the clamping connection of the second connecting part 222, the filter assembly (the combination of the filter connecting piece 1 and the filter element 2) is taken out from the shell 4 along with the spiral cover 3, at the moment, the oil return plug 13 is removed from the oil return hole 41 to drain oil, and then the filter connecting piece 1 and the filter element 2 are taken out from the spiral cover 3 by removing any radial rib 113 or the clamping connection of the second connecting part 221 of the filter connecting piece 1 and the second connecting part 222.

When the filter is disassembled, the oil return plug 13 is removed from the oil return hole 41 to drain oil, and the oil returns to the oil tank through the oil return hole 41.

Referring to fig. 3, a second embodiment of a filter connecting member according to the present utility model is shown, in which the guide ribs 17 are a plurality of ribs arranged offset from each other, so as to maintain a wide guide channel.

Referring to fig. 4, a third embodiment of a filter assembly according to the present utility model is shown, in which the axial rib 112 is provided with an inwardly protruding engagement portion 115. The clamping portion 115 is used for being matched and clamped with the spiral cover 3.

Referring to fig. 16, a fourth embodiment of a filter connecting member according to the present utility model is shown, in which the filter connecting member 1 is used for connecting a filter element 2 and a housing 4, and includes a tubular frame portion 11, an end disc 12 connected to the frame portion 11, and an oil return plug 13 eccentrically disposed on the outer side of the end disc 12, wherein the oil return plug 13 is used for sealing an oil return channel of the housing 4 to ensure normal system oil pressure; an opening 16 is provided at the center of the end plate 12, and a guide 14 is provided inside the opening 16. The guide part 14 can be a guide rib for circumferential positioning of the filter connecting piece 1 in the filter shell, so that the installation reliability is improved; the oil return plug 13 and the guide part 14 are simultaneously arranged on the end disc 12 of the filter connecting piece 1, the position between the oil return plug 13 and the guide part 14 is fixed and controllable, and the position between the oil return plug 13 and the guide part 14 cannot generate position offset in the installation and use process, so that the filter connecting piece has the characteristic of reliable installation.

In this embodiment, the guide portion 14 is disposed inside the opening 16 and protrudes radially inward.

Referring to fig. 7, a second embodiment of a filter assembly according to the present utility model is shown, in which the second end cap 23 is provided with a sealing lip 116, the sealing lip 116 has elasticity, and the sealing lip 116 is used to eliminate the installation axial gap, so as to improve the sealing performance of the filter assembly.

Referring to fig. 8, in a third embodiment of the filter assembly according to the present utility model, the second end cap 23 is provided with a sealing lip 116, the frame 11 is provided with a circular sheet 111, and the sealing lip 116 cooperates with the circular sheet 111 to eliminate the installation axial gap, thereby improving the sealing performance of the filter assembly.

Referring to fig. 9, a fourth embodiment of a filter assembly according to the present utility model is provided, in which an elastomer 117 is disposed between the frame portion and the end cap of the filter element, and the elastomer 117 is used to eliminate the axial gap for installation, thereby improving the sealing performance of the filter assembly.

Referring to fig. 11, a fifth embodiment of a filter assembly according to the present utility model is shown, in which the second connecting portion 221 is disposed at a position away from the center of the first end cap 22 and away from the first end cap 22.

Referring to fig. 12, a sixth embodiment of a filter assembly according to the present utility model is shown, in which the second connecting portion 221 is disposed at a center of the first end cap 22, and the first end cap 22 is provided with an opening 223 at a center.

Referring to fig. 13, a seventh embodiment of a filter assembly according to the present utility model is shown, in which the second connecting portion 221 is disposed at a position of the first end cap 22 away from the center of the first end cap 22, and the center of the first end cap 22 is provided with an opening 223.

Referring to fig. 6, an eighth embodiment of a filter assembly according to the present utility model is shown, in which the second end cap 23 is provided with an outwardly annular protrusion 24, and the inner diameter of the annular protrusion 24 is not greater than the outer diameter of the circular sheet 111. The annular bulge 24 is used for installing and sealing connection of the filter element 2 and the filter connecting piece 1, eliminating an installation axial gap and improving the sealing effect between the filter element 2 and the filter connecting piece 1.

In a ninth embodiment of the filter assembly of the present utility model, in this embodiment, the oil return plug 13 and the guide portion 14 are integrally formed with the end disc 12. The position between the oil return plug 13 and the guide part 14 is controllable, so that the phenomenon that the oil return plug 13 cannot be installed in place due to rotation of the filter assembly is avoided. By arranging the oil return plug 13 and the guide part 14 on the filter connecting piece 1 at the same time, the oil return plug 13 and the guide part 14 are integrally formed on the filter connecting piece 1, and the manufacturing process is simplified.

The oil return plug 13 and the guide part 14 are simultaneously arranged on the filter connecting piece 1, the oil return plug 13 and the guide part 14 are integrally formed on the framework part, the mutual positions of the oil return plug 13 and the guide part 14 are fixed and controllable, and the situation that the oil return plug 13 cannot be installed in place due to the mutual position deviation between the oil return plug 13 and the guide part 14 can not occur; the filter connecting piece 1 and the filter element 2 are arranged separately, and the manufacturing process is simple; in addition, this device can process filter connecting piece 1 and filter core 2 respectively, carries out back assembly connection with filter core 2 and filter connecting piece 1 again, and when necessary, can split filter core 2 and filter connecting piece 1 after the connection.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (17)

1. A filter connecting piece (1) for the connection of filter core (2), casing (4), its characterized in that: the oil return plug comprises a tubular framework part (11) and an end disc (12) connected with the framework part (11), wherein an oil return plug (13) is eccentrically arranged on the outer side of the end disc (12), an opening part (16) is arranged at the center of the end disc (12), and a guide part (14) is arranged on the inner side of the framework part (11) or the inner side of the opening part (16).

2. A filter connection according to claim 1, wherein: the guide part (14) is arranged inside the framework part (11) or inside the opening part (16) and protrudes inwards in the radial direction.

3. A filter connection as claimed in claim 2, wherein: the guide part (14) is in a long rib shape or an elliptic shape or a diamond shape.

4. A filter connection according to claim 1, wherein: the novel oil pipe is characterized in that a plurality of axial rib plates (112) are axially arranged on the framework portion (11), a plurality of radial rib plates (113) are radially arranged on the framework portion (11), and the axial rib plates (112) and the radial rib plates (113) are staggered to form oil holes (114).

5. A filter connection according to claim 1, wherein: the periphery of the framework part (11) is provided with guide ribs (17).

6. The filter connection according to claim 5, wherein: the guide rib (17) is a spiral rib plate or a plurality of rib plates which are staggered mutually.

7. A filter connection according to claim 1, wherein: the skeleton part (11) is near the inner side of the end disc (12) and extends radially outwards to form a circular sheet (111).

8. The filter connection according to claim 7, wherein: the thickness of the circular sheet (111) is 0.5 mm-2.5 mm.

9. A filter connection according to claim 1, wherein: the inner wall of the framework part (11) extends radially inwards to form a clamping part (115) for connecting the spiral cover (3).

10. A filter connection according to claim 1, wherein: the oil return plug (13) and the guide part (14) are integrally formed with the end disc (12).

11. A filter assembly, characterized in that: including filter core (2) and filtration connecting piece (1) according to any one of claims 1~10, filtration connecting piece (1) with filter core (2) separable setting, filter core (2) are including annular filter medium (21), first end cover (22) and second end cover (23) that are connected with filter medium (21) both ends respectively, hollow cavity (25), be equipped with on second end cover (23) with hollow cavity (25) link up central opening (231), hollow cavity (25) and central opening (231) of second end cover (23) can hold skeleton portion (11) of filtration connecting piece (1) for inject filter core (2) radial position.

12. A filter assembly as claimed in claim 11, wherein: the first end cap (22) and/or the second end cap (23) are made of an elastomeric material.

13. A filter assembly as claimed in claim 12, wherein: the end faces of the first end cover (22) and/or the second end cover (23) are outwards provided with annular bulges (24).

14. A filter assembly as claimed in claim 11, wherein: the second end cap (23) is provided with an outwardly directed annular protrusion (24), the inner diameter of the annular protrusion (24) being no greater than the outer diameter of the circular sheet (111).

15. A filter assembly as claimed in claim 11, wherein: the first end cover (22) is provided with a first connecting part (222) for detachably connecting the framework part (11).

16. A filter assembly as claimed in claim 15, wherein: the first end cover (22) is provided with a second connecting part (221) for connecting the spiral cover (3).

17. A filter, characterized in that: comprising a filter assembly according to any one of claims 11 to 16, a housing (4) and a screw cap (3).